Question
A boat covers 24km upstream and 36km downstream in 6
hours while it covers 36km upstream and 24km downstream in 13/2 hours. The speed of the current is.ÂSolution
Let the speed of boat in still water =B and speed of stream =S 
In these types of questions, make factor of 24 and 36 and choose the common values which satisfy the above equations. 24=2,3,4,6,8 36=3,4,6,9,12 Choose the common factor. Put this value in equation (1) 
Speed of stream(current)=2km/h.
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